Mask Sizing
XS = 25-49 lbs (11-21 kgs) (fits children ages 3-5)
S = 50-74 lbs (22-33 kgs) (fits children ages 4-8)
M = 75-124 lbs (34-56 kgs) (fits children ages 9-12)
L = 125-179 lbs (57-79 kgs)
XL = 180-249 lbs (80-111 kgs)
XXL = 250 lbs and over (112 + kgs)
To ensure proper fit, please stretch the Mask tightly across one's face... as this will ensure proper "breathability."